How does a membrane type humidifier separate water from the gas stream?

A membrane type humidifier utilizes a hydrophobic membrane to separate water from the gas stream. This type of membrane is designed to allow water vapor to pass through while preventing liquid water from doing so. The hydrophobic nature means that the membrane repels water, ensuring that only the vapor can move across to humidify the gas.

In practical terms, when gas passes over one side of the hydrophobic membrane, water from the other side can evaporate into the gas stream without allowing water droplets to coalesce and travel with it. This method is particularly effective because it maintains a higher level of humidity in the gas while avoiding any contamination or dilution that liquid water might introduce.

Other methods mentioned, such as using a biodegradable filter, mechanical agitation, or a chemical reaction, do not pertain to the function of a membrane type humidifier. Filters are typically used for capturing particulates, mechanical agitation does not aid in vapor transfer, and chemical reactions do not play a role in the humidification process of this specific type of device.